97 lines
3.2 KiB
C++
97 lines
3.2 KiB
C++
/* -*-c++-*- */
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/* osgEarth - Geospatial SDK for OpenSceneGraph
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* Copyright 2020 Pelican Mapping
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* http://osgearth.org
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*
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* osgEarth is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*/
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#ifndef OSGEARTH_HORIZON_CLIP_PLANE_H
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#define OSGEARTH_HORIZON_CLIP_PLANE_H 1
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#include <osgEarth/Common>
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#include <osgEarth/Horizon>
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#include <osgEarth/Containers>
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#include <osg/NodeCallback>
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#include <osg/CoordinateSystemNode>
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#include <osg/Plane>
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namespace osgEarth
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{
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/**
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* Installs an OpenGL clip plane that will clip graphics
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* at the geocentric horizon. Usage:
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*
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* HorizonClipPlane* hcp = new HorizonClipPlane();
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* hcp->setClipPlaneNumber(0);
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* mapNode->addCullCallback(hcp);
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*
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* Then, anywhere under that node that you want to apply clipping:
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*
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* node->getOrCreateStateSet()->setMode(GL_CLIP_DISTANCE0, 1);
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*/
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class OSGEARTH_EXPORT HorizonClipPlane : public osg::NodeCallback
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{
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public:
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//! Construct a new horizon clip plane with default (WGS84) ellipsoid
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HorizonClipPlane();
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//! Construct a new horizon clip plane with specific ellipsoid
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HorizonClipPlane(const Ellipsoid&);
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//! Set the GL clip plane to use. Default is zero.
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void setClipPlaneNumber(unsigned n);
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unsigned getClipPlaneNumber() const { return _num; }
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public: // osg::NodeCallback
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void operator()(osg::Node* node, osg::NodeVisitor* nv);
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public: // osg::Object
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virtual void resizeGLObjectBuffers(unsigned maxSize);
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virtual void releaseGLObjects(osg::State* state) const;
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private:
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unsigned _num;
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Ellipsoid _ellipsoid;
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struct PerCameraData {
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osg::ref_ptr<Horizon> horizon;
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osg::ref_ptr<osg::StateSet> stateSet;
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osg::ref_ptr<osg::Uniform> uniform;
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};
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typedef PerObjectFastMap<osg::Camera*, PerCameraData> DataMap;
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DataMap _data;
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struct ResizeFunctor : public DataMap::Functor {
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unsigned _s;
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ResizeFunctor(unsigned s) : _s(s) { }
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virtual void operator()(PerCameraData& data);
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};
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struct ReleaseFunctor : public DataMap::ConstFunctor {
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osg::State* _state;
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ReleaseFunctor(osg::State* state) : _state(state) { }
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virtual void operator()(const PerCameraData& data) const;
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};
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};
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} // namespace osgEarth
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#endif // OSGEARTH_HORIZON_CLIP_PLANE_H
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